Microbiology Study Guide
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Microbiology: An Introduction, 10e (Tortora et al.)
Chapter 21 Microbial Diseases of the Skin and Eyes
Objective Questions
1) Which of the following is NOT normal microbiota of the skin?
A) Streptococcus
B) Pityrosporum
C) Staphylococcus
D) Propionibacterium
E) Corynebacterium
Answer: A
Skill: Recall
2) An 8-year-old girl has scabs and pus-filled vesicles on her face and throat. Three weeks earlier she had visited her grandmother, who had shingles. What infection does the 8-year-old have?
A) Chickenpox
B) Measles
C) Fever blisters
D) Scabies
E) Rubella
Answer: A
Skill: Analysis
3) Which of the following pairs is mismatched?
A) Staphylococcus aureus – impetigo
B) Streptococcus pyogenes – erysipelas
C) Propionibacterium acnes – pimples
D) Pseudomonas aeruginosa – otitis externa
E) Str. pyogenes – toxic shock syndrome
Answer: C
Skill: Analysis
4) The etiologic agent of warts is
A) Papovavirus.
B) Poxvirus.
C) Herpesvirus.
D) Parvovirus.
E) Staphylococcus aureus .
Answer: A
Skill: Recall
5) Which of the following is NOT a characteristic of Pseudomonas aeruginosa?
A) Gram-positive cell wall
B) Oxidative metabolism
C) Oxidase-positive
D) Produce pyocyanin
E) Rod shaped
Answer: A
Skill: Recall
6) Which of the following pairs is mismatched?
A) Pustular rash – smallpox
B) Koplik spots – rubella
C) Papular rash – measles
D) Vesicular rash – chickenpox
E) Macular rash – fifth disease
Answer: B
Skill: Recall
7) Which of the following is NOT transmitted by the respiratory route?
A) Smallpox
B) Chickenpox
C) Rubella
D) Trichophyton
E) Measles
Answer: D
Skill: Analysis
8) Which of these is NOT caused by herpesvirus?
A) Chickenpox
B) Shingles
C) Keratitis
D) Smallpox
E) Roseola
Answer: D
Skill: Recall
9) Thrush and vaginitis are caused by
A) Herpesvirus.
B) Chlamydia trachomatis.
C) Candida albicans.
D) Staphylococcus aureus.
E) Streptococcus pyogenes.
Answer: C
Skill: Recall
10) The greatest single cause of blindness in the world is
A) Neonatal gonorrheal ophthalmia.
B) Keratoconjunctivitis.
C) Trachoma.
D) Inclusion conjunctivitis.
E) Pinkeye.
Answer: C
Skill: Recall
11) Which of the following can be treated with topical chemotherapeutic agents?
A) Herpes gladiatorium
B) Sporotrichosis
C) Dermatomycosis
D) Rubella
E) Shingles
Answer: C
Skill: Analysis
12) Which of the following is NOT a cause of ringworm?
A) Microsporum
B) Trichophyton
C) Tinea capitis
D) Epidermophyton
E) All of the above may cause ringworm.
Answer: C
Skill: Analysis
13) Newborns' eyes are treated with an antibiotic
A) When Neisseria gonorrhoeae is isolated from the eyes.
B) When the mother is blind.
C) When the mother has genital herpes.
D) When the mother has gonorrhea.
E) Always.
Answer: E
Skill: Recall
14) A possible complication of herpetic keratitis is
A) Encephalitis.
B) Fever blisters.
C) Subacute sclerosing panencephalitis.
D) Congenital rubella syndrome.
E) Macular rash.
Answer: A
Skill: Recall
15) Which of the following is sensitive to penicillin?
A) Chlamydia
B) Herpesvirus
C) Candida
D) Streptococcus
E) Pseudomonas
Answer: D
Skill: Understanding
16) Which region of the skin supports the largest bacterial population?
A) Axilla
B) Scalp
C) Forearms
D) Legs
E) All are equal.
Answer: A
Skill: Recall
17) Which infection is NOT caused by Staphylococcus aureus?
A) Pimples
B) Sty
C) Furuncle
D) Carbuncle
E) Acne
Answer: E
Skill: Recall
18) Which of the following is NOT a characteristic used to identify Streptococcus pyogenes?
A) Coagulase-positive
B) Group A cell wall antigen
C) Group M proteins
D) Beta-hemolytic
E) Cocci
Answer: A
Skill: Recall
19) Which of the following is NOT a causative agent of conjunctivitis?
A) Chlamydia trachomatis
B) Herpes simplex
C) Adenovirus
D) Neisseria gonorrhoeae
E) Haemophilus influenzae
Answer: D
Skill: Recall
20) In which of the following respects is measles similar to German measles (rubella)?
A) Rash
B) Etiologic agent
C) Encephalitis as a complication
D) Congenital complications
E) In name only
Answer: E
Skill: Analysis
21) Vaccination for rubella
A) Is not necessary because the disease is mild.
B) Is not necessary if a person has had an infection.
C) Is recommended only for pregnant women.
D) Is recommended for newborns to prevent congenital disease.
E) Has reduced incidence of rubella.
Answer: E
Skill: Analysis
22) Which of the following statements about congenital rubella syndrome is false?
A) It is contracted in utero.
B) It may be fatal.
C) It may result in deafness, blindness, and mental retardation.
D) It doesn't occur with subclinical infections.
E) All of the above are true.
Answer: D
Skill: Recall
23) The etiologic agent of chickenpox is
A) Herpes simplex.
B) Herpes zoster.
C) HHV-6.
D) Parvovirus.
E) Poxvirus.
Answer: B
Skill: Recall
24) The etiologic agent of fifth disease is
A) Herpes simplex.
B) Herpes zoster.
C) HHV-6.
D) Parvovirus.
E) Poxvirus.
Answer: D
Skill: Recall
25) The etiologic agent of roseola is
A) Herpes simplex.
B) Herpes zoster.
C) HHV-6.
D) Parvovirus.
E) Poxvirus.
Answer: C
Skill: Recall
26) The etiologic agent of fever blisters is
A) Herpes simplex.
B) Herpes zoster.
C) HHV-6.
D) Parvovirus.
E) Poxvirus.
Answer: A
Skill: Recall
27) Which of the following is used to treat epidemic herpetic keratitis?
A) Penicillin
B) Sulfonamide
C) Trifluridine
D) Fungicide
E) None of the above
Answer: C
Skill: Understanding
28) Which of the following is used to treat smallpox?
A) Penicillin
B) Sulfonamide
C) Trifluridine
D) Fungicide
E) None of the above
Answer: E
Skill: Understanding
29) Which of the following is used to treat sporotrichosis?
A) Penicillin
B) Sulfonamide
C) Trifluridine
D) Fungicide
E) None of the above
Answer: D
Skill: Understanding
30) Which of the following is used to treat candidiasis?
A) Penicillin
B) Sulfonamide
C) Trifluridine
D) Fungicide
E) None of the above
Answer: D
Skill: Understanding
31) Scabies is a skin disease caused by
A) A slow virus.
B) A protozoan.
C) A mite.
D) A bacterium.
E) A prion.
Answer: C
Skill: Recall
32) Scabies is transmitted by
A) Fomites.
B) Food.
C) Water.
D) Soil.
E) B and C.
Answer: A
Skill: Recall
33) A patient has pus-filled vesicles and scabs on her face, throat, and lower back. She most likely has
A) Measles.
B) Mumps.
C) Chickenpox.
D) Rubella.
E) Smallpox.
Answer: C
Skill: Recall
34) Which of the following leads to all the others?
A) Toxemia
B) Scalded skin syndrome
C) Staphylococcal infection
D) TSST-1
E) Sudden drop in blood pressure
Answer: C
Skill: Understanding
35) Buruli ulcer is caused by
A) Direct contact.
B) Acid-fast bacteria.
C) A fungus.
D) A virus.
E) A mite.
Answer: B
Skill: Recall
36) The patient has a papular rash. Microscopic examination of skin scrapings reveals small 8-legged animals. The etiology is
A) Candida
B) Microsporum
C) Pseudomonas aeruginosa
D) Staphylococcus aureus
E) Sarcoptes
Answer: E
Skill: Analysis
37) The patient has vesicles and scabs over her forehead. Microscopic examination of skin scrapings shows gram-positive cocci in clusters. The etiology is
A) Candida
B) Microsporum
C) Pseudomonas aeruginosa
D) Staphylococcus aureus
E) Sarcoptes
Answer: D
Skill: Analysis
38) The patient has scaling skin on his fingers. Conidiospores are seen in microscopic examination of skin scrapings. The etiology is
A) Candida
B) Microsporum
C) Pseudomonas aeruginosa
D) Staphylococcus aureus
E) Mycobacterium ulcerans
Answer: B
Skill: Analysis
39) A 45-year-old man has pus-filled vesicles distributed over his back in the upper right quadrant, over his right shoulder, and upper right quadrant of his chest. His symptoms are most likely due to
A) Candida albicans.
B) Herpes simplex virus.
C) Staphylococcus aureus.
D) Streptococcus pyogenes.
E) Varicella-zoster virus.
Answer: E
Skill: Analysis
40) A 35-year-old woman has a red, raised rash on the inside of her thighs. Gram-stained skin scrapings show large budding cells with pseudohyphae. The infection is caused by
A) Candida albicans.
B) Herpes simplex virus.
C) Staphylococcus aureus.
D) Streptococcus pyogenes.
E) Varicella-zoster virus.
Answer: A
Skill: Analysis
41) Cytoplasmic inclusions were observed in a fetus that died in utero after 6 months' gestation. The probable cause of the fetus's death was
A) Fifth disease.
B) Herpes simplex.
C) Measles.
D) Staphylococcus aureus.
E) Streptococcus pyogenes.
Answer: A
Skill: Analysis
42) Assume that your lab partner swabs the side of his face and used the swab to inoculate a nutrient agar plate. The next day, he performs a Gram stain on the colonies. They are gram-positive cocci. You advise him that he should next look for
A) An acid-fast reaction.
B) A coagulase reaction.
C) Conidiospores.
D) Pseudohyphae.
E) Pseudopods.
Answer: B
Skill: Understanding
43) Which of the following pairs is mismatched?
A) Chickenpox – Poxvirus
B) Conjunctivitis – Chlamydia trachomatis
C) Keratitis – Acanthamoeba
D) Infected tissue fluoresces – Dermatomycosis
E) Buruli ulcer – Mycobacterium
Answer: A
Skill: Recall
44) A 17-year-old boy has pus-filled cysts on his face and upper back. Microscopic examination reveals gram-positive rods. This infection is caused by
A) Acanthamoeba.
B) Herpes simplex virus.
C) Propionibacterium acnes.
D) Staphylococcus aureus.
E) Streptococcus pyogenes.
Answer: C
Skill: Analysis
45) Which of the following is NOT likely to spread MRSA among athletes?
A) Physical contact
B) Whirlpool baths
C) Taping gels
D) Antibiotic resistance
E) Shared equipment
Answer: D
Skill: Analysis
Essay Questions
1) A teenaged boy knew an over-the-counter cortisone preparation would decrease the swelling and redness of insect bites and poison ivy, so he used it to decrease the swelling and redness of pimples. Why, in 24 hours, were his pimples more inflamed?
2) A 56-year-old Army officer received a smallpox vaccination at a military vaccination clinic. Within 2 weeks, a painful ulcer was noted at the vaccination site. Because of the appearance of an increasing number of peripheral lesions and because of continued enlargement of the initial ulcer, he was treated. Eventual recovery was complicated by Pseudomonas sepsis and the need for a skin graft at the vaccination site. What was the cause of the ulcer and lesions, and what were the treatments? What caused the Pseudomonas infection?
kevin norton
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